JPS6234960Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an operating device for a bendable aerial work vehicle in which a lower boom and an upper boom are pivotally connected.

In a bending type aerial work vehicle, the lower boom is pivotally supported on the swivel base so that it can be raised and lowered freely, the Atsupa boom is pivotally connected to the tip of the lower boom so that it can be bent and extended, and the work platform is held in balance at the tip of the Atsupa boom. Depending on the position, when the lower boom is raised (lowered), the work platform may be lowered (raised), so if the operator is unable to operate the boom or work platform due to incorrect operation. There was a risk of an accident such as collision with an obstacle.

The present invention has been developed in view of the above circumstances, and aims to provide an operating device for a bending type aerial work vehicle that displays the direction of movement of the work platform by operating the lower boom and prevents erroneous operation. This is the purpose.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a bendable and extendable aerial work vehicle, in which a swing base 4 is provided on a vehicle body 1 supported by outriggers 2 and 3, and the base end of a lower boom 5 is pivotally supported on the swing base 4. and the lower boom 5 is connected to the luffing cylinder 6
The upper boom 7 is pivotally connected to the tip of the lower boom 5, and the upper boom 7 is bent and extended by the expansion and contraction of the bending cylinder 8. A workbench 9 is held in equilibrium at the tip of the upper boom 7, and the workbench 9 is equipped with an operating device 10.

As shown in FIG. 2, when the lower boom 5 and the work platform 9 are on the same side with the vertical line 13 passing through the pivot point of the swing base 4 and the lower boom 5 as the boundary, the lower boom 5 and the work platform 9 will move. In agreement, when the lower boom 5 is raised, the work platform 9 will also be raised, and when the lower boom 5 is lowered, the work platform 9 will also be lowered, but when the lower boom 5 and the work platform 9 are on different sides, the lower boom 5 and the work platform will be lowered. The movement of 9 is reversed, and when the lower boom 5 is raised and lowered, the work platform 9
is lowered, and when the lower boom 5 is lowered, the work platform 9 is raised.

That is, the positions of the lower boom and the workbench are determined by the lengths of the lower boom and the upper boom, the up-and-down angle of the lower boom with respect to the horizontal plane, and the bending and stretching angles formed by the lower boom and the upper boom, and the direction of movement of the workbench when the lower boom is operated is determined.

Therefore, when the lengths of the lower boom and the upper boom are equal, when the heave angle θ ₁ of the lower boom 5 with respect to the horizontal plane and the bending/extension angle θ ₂ formed by the lower boom 5 and the upper boom 7 satisfy the relationship θ ₂ > 2θ ₁ , the lower boom 5 The movement of workbench 9 coincides with
When the relationship θ ₂ >2θ ₁ is satisfied, the movements of the lower boom 5 and the work platform 9 are reversed.

The pivoting portion of the lower boom 5 of the swing base 4 is equipped with a luffing angle detector 11 that detects the luffing angle of the lower boom with respect to the horizontal plane, and the pivoting joint between the lower boom 5 and the upper boom 7 is equipped with a luffing angle detector 11 that detects the bending/extending angle formed by the lower boom and the upper boom. Bending/extending angle detector 1 to detect
2, and as shown in FIG.
3, and the discriminator 13 discriminates the relationship between the luffing angle and the bending/extending angle, that is, the moving direction of the work platform 9 when the lower boom 5 is operated.
is an indicator light 1 provided on the lower boom operating section 10' and indicating the operating side for raising (lowering) the work platform 9.
4 and 15.

With the above configuration, the elevation angle θ of the lower boom 5
₁ and the bending/extending angle θ ₂ of the lower boom 5 and upper boom 7 are constantly detected, and a discriminator 13 determines whether the work platform 9 is raised or lowered when the lower boom 5 is operated. The direction in which the work platform 9 is raised (lowered) is displayed on the indicator lights 14 and 15. In other words, indicator light 1
4 and 15, one of which lights up depending on whether the lower boom and workbench are on the same side or on different sides with the vertical line passing through the pivot point of the swing base and lower boom as the boundary.

As described above, according to the present invention, in a bendable aerial work vehicle, the moving direction of the work platform when operating the lower boom, which changes depending on the condition of the boom, is always displayed. The occurrence of accidents is also prevented, and the present invention is effective in improving the operability and safety of the bending type aerial work vehicle.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a bending type aerial work vehicle, Fig. 2 is an explanatory diagram of the operation of the bending type aerial work vehicle, and Fig. 3 is an explanatory diagram of the operating device. . 5...Lower boom, 7...Atsupa boom, 9...
. . . Workbench, 10 . . . Operating device, 11 . . . Luffing angle detector, 12 .

Claims (1)

[Scope of utility model registration request] A luffing angle detector that detects the luffing angle of the lower boom with respect to the horizontal plane, a bending angle detector that detects the bending angle formed by the lower boom and the upper boom, a discriminator that determines the relationship between the luffing angle and the bending angle, and a The present invention is characterized by comprising a workbench movement direction indicator that is provided corresponding to both operation positions and is activated by a signal from a discriminator to display the operating direction in which the workbench is raised or the workbench is lowered. An operating device for a bending type aerial work vehicle.